A malignant neoplasm of the lips or mouth most commonly occurring in men over the age of 60, often associated with tobacco use, especially pipe smoking, and with alcoholism, syphilis, and poor oral hygiene. Premalignant leukoplakia or lip or mouth lesions may occur. Treatment depends on the size and location of the neoplasm and may include surgery, irradiation, and chemotherapy.
Cancer in any part of the mouth or oral cavity, including the lips, tongue, floor of the mouth, lining of the cheeks, tonsils, and gums. Also known as mouth cancer, oral cancers are common and can be detected during examination of the mouth by a doctor or dentist. The most frequent cause of oral cancer is tobacco use, including chewing tobacco and smoking cigarettes, pipes, or cigars.